<PAGE>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 144
NOTICE OF PROPOSED SALE OF SECURITIES
PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
OMB APPROVAL
---------------------------
OMB Number: 3235-0101
Expires: September 30, 1995
Estimate average burden
hours per response .... 2.0
---------------------------
---------------------------
SEC USE ONLY
---------------------------
DOCUMENT SEQUENCE NO.
---------------------------
CUSIP NUMBER
---------------------------
WORK LOCATION
---------------------------
ATTENTION: Transmit for filing 3 copies of this form concurrently with either
placing an order with a broker to execute sale or executing a sale
with a market maker.
- --------------------------------------------------------------------------------
1(a) NAME OF ISSUER (Please type or print)
CYTOGEN CORPORATION (CYTO)
- --------------------------------------------------------------------------------
(b) IRS IDENT. NO.
222322400
- --------------------------------------------------------------------------------
(c) S.E.C. FILE NO.
- --------------------------------------------------------------------------------
1(d) ADDRESS OF ISSUER STREET CITY STATE ZIP CODE
600 COLLEGE ROAD EAST, PRINCETON, NJ 08540
- --------------------------------------------------------------------------------
(e) TELEPHONE NUMBER
- --------------------------
AREA CODE NUMBER
609 987-8200
------ --------------
- --------------------------------------------------------------------------------
2(a) NAME OF PERSON FOR WHOSE ACCOUNT THE SECURITIES ARE TO BE SOLD
JOHN D. RODWELL
- --------------------------------------------------------------------------------
(b) SOCIAL SECURITY NO OR IRS IDENT. NO.
- --------------------------------------------------------------------------------
(c) RELATIONSHIP TO ISSUER
OFFICER
- --------------------------------------------------------------------------------
(d) ADDRESS STREET CITY STATE ZIP CODE
1340 EAGLE ROAD NEW HOPE PA 18938
- --------------------------------------------------------------------------------
INSTRUCTION: The person filing this notice should contact the issuer to obtain
the I.R.S. Identification Number and the S.E.C. file Number.
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------
3(a) (b) SEC USE ONLY (c)
Title of the Name and Address of Each Broker Through Whom the ------------- Number of Shares
Class of Securities are to be Offered or Each Market Broker-Dealer or Other Units
Securities Maker who is Acquiring the Securities File Number To Be Sold
To be Sold (See instr. 3(c))
- ---------------- ---------------------------------------------------- ------------- ---------------------
<S> <C> <C> <C>
COMMON STOCK DEAN WITTER REYNOLDS, INC. 19,100
200 E. NEW ENGLAND AVE, 4TH FL.
WINTER PARK, FL 32789
- ---------------- ---------------------------------------------------- ------------- ---------------------
- ---------------- ---------------------------------------------------- ------------- ---------------------
- ---------------- ---------------------------------------------------- ------------- ---------------------
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------
(d) (e) (f) (g)
Aggregate Number of Shares Approximate Name of Each
Market or Other Units Date of Sale Securities
Value Outstanding (See instr. 3(f)) Exchange
(See instr. 3(d)) (See instr. 3(e)) (MO. DAY YR.) (See instr. 3(g))
- -------------------- -------------------- ------------------- -------------------
<S> <C> <C> <C>
$105,050 51,081,533 4/4/97 NASDAQ
- -------------------- -------------------- ------------------- -------------------
- -------------------- -------------------- ------------------- -------------------
- -------------------- -------------------- ------------------- -------------------
</TABLE>
INSTRUCTIONS
1. (a) Name of Issuer
(b) Issuer's I.R.S. Identification Number
(c) Issuer's S.E.C. file number, if any
(d) Issuer's address, including zip code
(e) Issuer's telephone number, including area code
2. (a) Name of person for whose account the securities are to be sold
(b) Such person's Social Security or I.R.S. identification number
(c) Such person's relationship to the issuer (e.g., officer, director, 10%
stockholder, or member of immediate family of any of the foregoing)
(d) Such person's address, including zip code
3. (a) Title of the class of securities to be sold
(b) Name and address of each broker through whom the securities are intended
to be sold
(c) Number of shares or other units to be sold (if debt securities, give the
aggregate face amount)
(d) Aggregate market value of the securities to be sold as of a specified
date within 10 days prior to the filing of this notice.
(e) Number of shares or other units of the class outstanding, or if debt
securities the face amount thereof outstanding, as shown by the most
recent report or statement published by the issuer
(f) Approximate date on which the securities are to be sold
(g) Name of each securities exchange, if any, on which the securities are
intended to be sold
SEC 1147 (9-93)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
<TABLE>
<CAPTION>
TABLE I -- SECURITIES TO BE SOLD
Furnish the following information with respect to the acquisition of the securities to be sold
and with respect to the payment of all or any part of the purchase price or other consideration therefor:
Name of Person
Whom Acquired
Title of Date you (If gift, also give Amount of Date of
the Class Acquired Nature of Acquisition Transaction date donor acquired) Securities Acquired Payment Nature of Payment
- --------- -------- --------------------------------- --------------------- ------------------- ------- -----------------
<S> <C> <C> <C> <C> <C> <C>
COMMON 11/30/88 STOCK OPTION (RIGHT TO BUY) CYTOGEN CORPORATION 3,100
STOCK
COMMON 01/26/89 STOCK OPTION (RIGHT TO BUY) CYTOGEN CORPORATION 4,000
STOCK
COMMON 12/08/94 STOCK OPTION (RIGHT TO BUY) CYTOGEN CORPORATION 12,000
STOCK
- --------- -------- --------------------------------- --------------------- ------------------- ------- -----------------
</TABLE>
INSTRUCTIONS: 1. If the securities were purchased and full payment therefor was
not made in cash at the time of purchase, explain in the table
or in a note thereto the nature of the consideration given.
If the consideration consisted of any note or other obligation,
or if payment was made in installments describe the arrangement
and state when the note or other obligation was discharged in
full or the last installment paid.
2. If within two years after the acquisition of the securities the
person for whose account they are to be sold had any short
positions, put or other option to dispose of securities
referred to in paragraph (d)(3) of Rule 144, furnish full
information with respect thereto.
<TABLE>
<CAPTION>
TABLE II -- SECURITIES SOLD DURING THE PAST 3 MONTHS
Furnish the following information as to all securities of the issuer sold during
the past 3 months by the person for whose account the securities are to be sold.
Amount of
Name and Address of Seller Title of Securities Sold Date of Sale Securities Sold Gross Proceeds
- ------------------------------------- ---------------------------- ---------------- ----------------- ----------------
<S> <C> <C> <C> <C>
JOHN D. RODWELL NONE
- ------------------------------------- ---------------------------- ---------------- ----------------- ----------------
</TABLE>
REMARKS:
INSTRUCTIONS:
See the definition of "person" in paragraph (a) of Rule 144. Information is to
be given not only as to the person for whose account the securities are to be
sold but also as to all other persons included in that definition. In addition,
information shall be given as to sales by all persons whose sales are required
by paragraph (e) of Rule 144 to be aggregated with sales for the account of the
person filing this notice.
APRIL 3, 1997
----------------------------------------
DATE OF NOTICE
ATTENTION:
The person for whose account the securities to which this notice relates are to
be sold hereby represents by signing this notice that he does not know any
material adverse information in regard to the current and prospective operations
of the Issuer of the securities to be sold which has not been publicly
disclosed.
\S\ JOHN D. RODWELL
----------------------------------------
SIGNATURE
JOHN D. RODWELL
The notice shall be signed by the person for whose account the securities
are to be sold. At least one copy of the notice shall be manually signed.
Any copies not manually signed shall bear typed or printed signatures.
- --------------------------------------------------------------------------------
ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSION OF FACTS CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)
- --------------------------------------------------------------------------------
SEC 1147 (9-93)
