Maybe

SELECT * FROM gallery2 WHERE topic_id="1374653" UNION SELECT * FROM gallery2 WHERE topic_id="1270985" UNION SELECT * FROM gallery2 WHERE topic_id="766134" UNION SELECT * FROM gallery2 WHERE topic_id="1702188" UNION SELECT * FROM gallery2 WHERE topic_id="612873" UNION SELECT * FROM gallery2 WHERE topic_id="1612948" UNION SELECT * FROM gallery2 WHERE topic_id="1803196" UNION SELECT * FROM gallery2 WHERE topic_id="1177891" UNION SELECT * FROM gallery2 WHERE topic_id="12681" UNION SELECT * FROM gallery2 WHERE topic_id="1042740" UNION SELECT * FROM gallery2 WHERE topic_id="328977" UNION SELECT * FROM gallery2 WHERE topic_id="328896" UNION SELECT * FROM gallery2 WHERE topic_id="1304408" UNION SELECT * FROM gallery2 WHERE topic_id="1100513" UNION SELECT * FROM gallery2 WHERE topic_id="1230441" UNION SELECT * FROM gallery2 WHERE topic_id="300438"